Founded in 1927 as a plumbing contractor Walter N. Yoder & Sons Inc. is a full service mechanical contractor. Based in Cumberland, Md., the company offers a wide array of products and services in the lines of industrial work, pipe/metal fabrication, water/wastewater treatment and site work among others. It is equipped with excavators, backhoes, dozers, trenchers, cranes, dump trucks/tractors/trailers and small support equipment. Walter N. Yoder & Sons Inc. is affiliated with Virginia. Potomac Metal & Supply Co.